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Note 4 - Investments (Details Textual) - USD ($) | 12 Months Ended |
--- | --- | ---
Apr. 30, 2021 | Dec. 31, 2020 | Apr. 30, 2020 | Dec. 31, 2019 | Apr. 30, 2019 | May 01, 2018
Equity Securities, FV-NI, Cost | $ 19,105,000 |  | $ 12,877,000 |  |  |
Equity Securities, FV-NI, Total | 23,582,000 |  | 14,125,000 |  |  | $ 9,379,000
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent, Total | (128,000) | $ 97,000 | 97,000 | $ 36,000 | $ 36,000 |
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax | (45,000) |  | 37,000 |  | 10,000 |
Proceeds from Sale of Equity Securities, FV-NI | 8,212,000 |  | 4,387,000 |  |  |
Equity Securities, FV-NI, Gain (Loss), Total | 1,481,000 |  | (581,000) |  | $ 0 |
Equity Method Investments | 60,977,000 |  | 59,165,000 |  |  |
EAM Trust [Member] |  |  |  |  |  |
Fair Value of Contributed Capital at Inception | 55,805,000 |  | 55,805,000 |  |  |
Cash and Liquid Securities in Excess of Working Capital Requirements Contributed to Capital Account | 5,820,000 |  |  |  |  |
Equity Method Investment, Other than Temporary Impairment | $ 0 |  | 0 |  |  |
Percentage of Non Voting Profit Interest | 50.00% |  |  |  |  |
Accrued Non Voting Revenues and Non Voting Profits Interests Payable | $ 4,664,000 |  | 2,949,000 |  |  |
Fixed Income Securities [Member] |  |  |  |  |  |
Proceeds from Sale and Maturity of Debt Securities, Available-for-sale, Total | 14,902,000 |  | 8,663,000 |  |  |
AOCI, Debt Securities, Available-for-sale, Adjustment, after Tax, Total | 4,000 |  | 177,000 |  |  |
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent, Total | (173,000) |  | 134,000 |  |  |
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax | $ (45,000) |  | $ 37,000 |  |  |
Debt Securities, Available-for-Sale, Weighted Average Yield | 1.40% |  | 2.27% |  |  |
Fixed Income Securities [Member] | AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member] |  |  |  |  |  |
AOCI Tax, Attributable to Parent | $ 1,000 |  | $ 46,000 |  |  |

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- Definition Amount, after tax, of accumulated unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=124509347&loc=d3e681-108580 + Details
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